Cantilever crane hinge point device capable of reducing volume of oil cavity

Abstract

The utility model relates to a boom hinge point device capable of reducing the volume of an oil cavity, which belongs to the technical field of rotary lubrication of cargo booms and comprises a boom hinge sleeve, a support and a hinge shaft, two ends of the hinge shaft are fixed on the support, a shaft sleeve is sleeved on a shaft body in the middle of the hinge shaft, and the boom hinge sleeve is rotatably sleeved on the shaft sleeve through two bearings which are arranged side by side at an interval; a positioning outer cylinder which is adaptively inserted into the inner sleeve wall of the arm support hinge sleeve is arranged between the two bearings, the two ends of the positioning outer cylinder correspondingly abut against outer rings of the two bearings respectively, the inner cylinder wall of the positioning outer cylinder protrudes to form a protruding ring part, and a first gap is reserved between the inner ring surface of the protruding ring part and the shaft sleeve; second gaps are reserved between the two ends of the convex ring part and the corresponding bearings, and an oil injection hole communicated to the center of the first gap is formed in the end face of the hinged shaft. The boom hinge point device not only can improve the convenience and uniformity of oil injection, but also can avoid blockage, failure and waste of lubricating oil.

Description

Technical Field

[0001] The utility model relates to the technical field of crane boom rotation lubrication, in particular to a boom hinge device capable of reducing the volume of an oil chamber. Background Art

[0002] It is well known that the jib of a gantry crane installed on a support is rotatably mounted on a hinge shaft through two bearings in order to ensure the stability of the swing and the strength of the connection. When lubricating the bearings, if oil is injected from the outer end face of the bearing like the bearing oiler disclosed in the public number CN201753731U, it is necessary to inject oil into the outer end faces of the two bearings at the same time, which is very inconvenient. In addition, since there is a large space between the two bearings, if the lubricating oil cannot be replaced in time, it will be squeezed and solidified, and it will also cause blockage, which will not only waste the lubricating oil but also reduce the lubrication effect of the bearings. Utility Model Content

[0003] In order to overcome the deficiencies in the background technology and solve existing technical problems, the utility model discloses an arm hinge device with a reduced oil chamber volume, which can not only improve the convenience and uniformity of oil injection, but also avoid lubricating oil blockage, failure and waste.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A boom hinge device for reducing the volume of an oil chamber comprises a boom hinge sleeve, a support and a hinge shaft with both ends fixed to the support, the middle shaft body of the hinge shaft being sleeved with a shaft sleeve, the boom hinge sleeve being rotatably sleeved on the shaft sleeve through two spaced-apart bearings; a positioning outer cylinder adapted to be inserted into the inner sleeve wall of the boom hinge sleeve is provided between the two bearings, the two ends of the positioning outer cylinder respectively abut against the outer rings of the two bearings, the inner cylinder wall of the positioning outer cylinder is raised to form a convex ring portion, a first gap is left between the inner ring surface of the convex ring portion and the shaft sleeve, a second gap is left between the two ends of the convex ring portion and the corresponding bearings, and an oil filling hole is provided on the end face of the hinge shaft which is connected to the center of the first gap.

[0006] Furthermore, the convex ring portion includes an inner tube and two supporting ring plates, the inner ring surfaces of the two supporting ring plates are sealed and fixed to both ends of the outer tube wall of the inner tube, and the outer ring surfaces of the two supporting ring plates are sealed and fixed to the inner tube wall of the positioning outer tube.

[0007] Furthermore, an annular groove is provided in the center of the inner sleeve wall of the shaft sleeve, and a plurality of through holes connected to the first gap are evenly arranged on the bottom of the annular groove. The inner end of the oil filling hole is connected to the annular groove through a radial hole.

[0008] Furthermore, the end surface of the arm hinge sleeve is installed with an end cover corresponding to the outer ring of the corresponding bearing, and the middle part of the outer wall of the sleeve is provided with a boss corresponding to the inner rings of the two bearings.

[0009] Furthermore, the first gap is less than 3 mm, and the second gap is 2 to 4 mm.

[0010] Furthermore, an oil nozzle is installed at the outer end of the oil filling hole.

[0011] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0012] The boom hinge device with reduced oil chamber volume disclosed by the utility model can directly inject oil into the middle of the two bearings through the oil injection hole on the end face of the hinge shaft, which is convenient and quick. Due to the symmetrical relationship between the two bearings, it can also ensure that the lubricating oil is injected evenly. Moreover, because the convex ring portion occupies the oil chamber volume, the injected lubricating oil can quickly reach the bearings on both sides, realizing lubrication of the bearings by the lubricating oil. During the flow and replacement process of the lubricating oil, there is no backlog, solidification or blockage, which greatly improves the lubrication effect and reduces waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic cross-sectional view of the implementation structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the connection structure between the positioning outer cylinder and the convex ring part.

[0015] In the figure: 1. Arm hinge sleeve; 2. Positioning outer cylinder; 3. End cover; 4. Bearing; 5. Bushing; 501. Ring groove; 6. Hinge shaft; 601. Oil filling hole; 7. Oil nozzle; 8. Support; 9. First gap; 10. Second gap; 11. Inner cylinder; 12. Support ring plate. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely corresponding to the drawings of the present invention and are for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction.

[0017] Combined with attachment Figure 1-2 The boom hinge device for reducing the volume of the oil chamber comprises a boom hinge sleeve 1, a support 8, and a hinge shaft 6 fixed to the support 8 at both ends. The middle shaft body of the hinge shaft 6 is fitted with a shaft sleeve 5. The boom hinge sleeve 1 is rotatably fitted on the shaft sleeve 5 via two spaced-apart bearings 4. As needed, an end cover 3 is mounted on the end face of the boom hinge sleeve 1, which contacts the outer rings of the corresponding bearings 4. A shoulder is provided in the middle of the outer wall of the shaft sleeve 5, which contacts the inner rings of the two bearings 4. The two bearings 4 are axially positioned by the shoulder and the end cover 3.

[0018] A positioning outer cylinder 2 is provided between the two bearings 4, which is adapted to be inserted into the inner sleeve wall of the arm hinge sleeve 1, so that the positioning outer cylinder 2 can rotate together with the arm hinge sleeve 1, and the two ends of the positioning outer cylinder 2 are respectively in contact with the outer rings of the two bearings 4. The positioning outer cylinder 2 can also axially position the bearings 4. The inner cylinder wall of the positioning outer cylinder 2 is raised to form a convex ring part. In order to ensure stable and balanced support, there is generally a certain distance between the two bearings 4. The convex ring part is used to occupy the space between the two bearings 4, thereby preventing excessive retention of lubricating oil; according to needs, the convex ring part includes an inner cylinder 11 and two supporting ring plates 12, and the inner ring surfaces of the two supporting ring plates 12 are aligned with the outer ring surfaces of the inner cylinder 11 The two ends of the cylinder wall are sealed and fixed, and the outer ring surfaces of the two support ring plates 12 are sealed and fixed to the inner cylinder wall of the positioning outer cylinder 2. Of course, in order to ensure the supporting effect, another support ring plate 12 can be set between the two support ring plates 12 for supporting connection, so as to ensure that the entire structure is light in weight and has high strength. A first gap 9 is left between the inner ring surface of the convex ring part and the shaft sleeve 5, and a second gap 10 is left between the two ends of the convex ring part and the corresponding bearing 4. Lubricating oil can flow through the first gap 9 and the second gap 10 for lubrication. In addition, the first gap 9 is less than 3 mm, generally set to 2 mm, and the second gap 10 is 2 to 4 mm, generally set to 3 mm.

[0019] The end face of the hinge shaft 6 is provided with an oil filling hole 601 connected to the center of the first gap 9; specifically, an annular groove 501 is provided in the center of the inner sleeve wall of the shaft sleeve 5, and the bottom of the annular groove 501 is evenly provided with multiple through holes connected to the first gap 9. The inner end of the oil filling hole 601 is connected to the annular groove 501 through a radial hole, so that the lubricating oil injected from the oil filling hole 601 can enter the first gap 9 evenly; in addition, an oil nozzle 7 is installed at the outer end of the oil filling hole 601 to facilitate the oil filling operation through the oil nozzle 7.

[0020] In the arm hinge device for reducing the volume of the oil chamber described in the present invention, after the lubricating oil is injected through the oil filling hole 601, it flows through the radial holes, the annular groove 501 and the through hole, enters the center of the first gap 9, and continues to flow to both ends, respectively entering the two second gaps 10, thereby evenly lubricating the two bearings. During the flow and replacement process of the lubricating oil, there is no accumulation, solidification or blockage, thereby improving the lubrication effect and reducing waste.

[0021] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A boom hinge device for reducing the volume of an oil chamber, comprising a boom hinge sleeve (1), a support (8), and a hinge shaft (6) with both ends fixed to the support (8), wherein a shaft sleeve (5) is sleeved on the middle shaft body of the hinge shaft (6), and the boom hinge sleeve (1) is rotatably sleeved on the shaft sleeve (5) via two spaced-apart bearings (4), wherein: A positioning outer cylinder (2) adapted to be inserted into the inner sleeve wall of the arm hinge sleeve (1) is provided between the two bearings (4), the two ends of the positioning outer cylinder (2) respectively contact the outer rings of the two bearings (4), the inner cylinder wall of the positioning outer cylinder (2) is raised to form a convex ring portion, a first gap (9) is left between the inner ring surface of the convex ring portion and the shaft sleeve (5), a second gap (10) is left between the two ends of the convex ring portion and the corresponding bearing (4), and an oil injection hole (601) connected to the center of the first gap (9) is provided on the end face of the hinge shaft (6).

2. The boom hinge device for reducing the oil chamber volume according to claim 1 is characterized in that: The convex ring portion comprises an inner cylinder (11) and two supporting ring plates (12), wherein the inner ring surfaces of the two supporting ring plates (12) are sealed and fixed to both ends of the outer cylinder wall of the inner cylinder (11), and the outer ring surfaces of the two supporting ring plates (12) are sealed and fixed to the inner cylinder wall of the positioning outer cylinder (2).

3. The boom hinge device for reducing the oil chamber volume according to claim 1 is characterized in that: An annular groove (501) is provided in the center of the inner sleeve wall of the shaft sleeve (5), and a plurality of through holes communicating with the first gap (9) are evenly arranged around the bottom of the annular groove (501). The inner end of the oil filling hole (601) is correspondingly communicated with the annular groove (501) via a radial hole.

4. The boom hinge device for reducing the oil chamber volume according to claim 1 is characterized in that: The end surface of the arm hinge sleeve (1) is provided with an end cover (3) corresponding to the outer ring of the corresponding bearing (4), and the middle part of the outer wall of the shaft sleeve (5) is provided with a boss corresponding to the inner ring of the two bearings (4).

5. The boom hinge device for reducing the oil chamber volume according to claim 1 is characterized in that: The first gap (9) is less than 3 mm, and the second gap (10) is 2 to 4 mm.

6. The boom hinge device for reducing the oil chamber volume according to claim 1 is characterized in that: An oil nozzle (7) is installed at the outer end of the oil filling hole (601).

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